Packing



Nov. 6, 192s. l l 1,69o,161-

w. w. EVANS PACKING Filed March 5, 1925 .Patented Nov. s, v192s.

UNITED STATES PATENT- orFvlcE.

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racxING.

-Applleation led l)latch 3, 1923, Serial No. A622,566.

This invention relates to an improved packing material adapted for various uses, -and particularly to be employed in the form ofl v a disk or gasket for" bottle seals. My object is to provide a packing Whlchl 1s substantially inert and impervious to a wlde variety of liquid and other substances, including drugs, chemicals and food preparataons, which conforms to the edge of and effectively Seals an ordinary bottle mouth when used in conjunction with a cap, and which is vrelatively inexpensive.

The accompanyin drawing is a perspective view, partly bro en away, showing a botl l5 tle capv provided with a packing disk constructed and lcompounded in accordance with Vmy inventlon.

In this instance, I have shown in the drawing an ordinary screw metal ca p 1', but. 2C' theinvention can be .used in connection with any'suitable form of cap closure or connection.

The packing element consists ,of a some- What compressible backing or foundation 2,

such as cardboard, and-an adherent, impervious facing 3 including a plastic gum -com- Apound of non-curing or unvulcanized rubber .and a waxy material such as paraffin wax. The wax serves '.to lasticize the rubber and give to the facing t enecessary impressioni0 ability, in connection with the cardboard backing, to-ll theirregularities encountered' in bott1e-mouth`rims, and it also renders the rubber waterproof, since unvulca'nized rubber wlll absorb up to 25% of its wel ht of water.` rubber, param Wax and a v enforcipg pig There is also preferably mixed with this plas# tic material a large proportion of a finelydivided, inert filler, or reenforcing pi suchas chemically prepared barium's phate (blanc xe), to add body and stiffness to 40 the plastic and aid in resisting temperature? I changes.

A preferred composition for the facing is made up, in proportions by weight, substantially as follows: v A Il l v Percent. Plantation rubber smoked sheets 35 `Bariumsulphate 55 Parailin wax 10 ent sible cardboard backing layer anda' facingV A layers can be more or less varied, but goo .results have 'been obtained wlth a cardboard The thickness 0fule backing 'and facin f Evans, or moN, omo, assIeNoa 'ro THE'B. r. Goo'Da'IH oonraNY, or

naw You, 1a. Y., a coaroaarroiv or Naw Yoan'.

of .05 inch thiclmessxand/a gum facing .015v

inch thick. Since the backing 2 is compressble andthe facing llayer 3 is merely adherent thereto as already stated, it follows that the material of said facing does not substantially impregnate said backing beyond the immediate surfaceiportion' thereof,- but leaves its resilience substantially unimpaired.

It willbe understood that various equivalents may be used, and the proportions and dimensions varied within the scope of m'y claims. example,the' percentage of bairium sulphate may'vary from about 55 to` about and the', rubber fromabout 35 to about 25, more or less, other waxes than parafin can be employed, and other illers'than barium sulphate.

`-1. Packing material adapted for bottle- `Seals andcomprising a relatively-thick, re-

silient backing, layer, and a relatively thin, impervious, plastic, facing layer adherent to sai backin layer and composed of unvulcanized rub er, wax, and a reenforcing pigment,`the backing layer being substantially freefro'm impregnation by 'the material of the facing' layer.

2.Ir n ressionable packing material for bottle seals comprisinga compressible cardboard backing layer and a plastic facing adherent thereto andcomposedr of unvulcanized meht.-v

3.A Packing material comprising a compresconsisting ofunvulcanized rubber, a powdered mineral filler, anda wax.v

v 4. Packing material comprising a compressible cardboard backing layer'and a facingv consisting of a major proportion of barium sul hate, a minor roportion of unvulcanized rub r and para 1n wax.

5. Packing material comprising ;a cardboard layer having a relatively thin facing thereon consistin of substantially 35% of unvulcanized -rub er, 55% of barium sull phate and 10% of parain wax; Y

In witne whereof I have hereunto set -my' hand this. 26th day of February, 1923.

, .i WALTER VW. Evansf 

